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Use stakes, mason’s string, and a string level to determine a drain path with an above-grade exit point below the level. Use a power edger or spade to cut the turf at the outside edges of the drain trench—usually 8″ to 14″ wide.
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Dig out a squared trench over the length of the drain. Place the dirt on a tarp next to the trench site. Use a 2 x 4 with a level on top to ensure the trench slopes slightly to outlet.
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Use a handheld turf cutter or spade to dig up the sod along the trench line. Store the cut sod in a cool, shaded place and moisten regularly while you dig the trench.
Line the bottom of the trench from start to end with permeable landscape fabric wide enough to run 1 ft. up each side. Add about 1″ of washed gravel to the bottom of the trench.
Lay perforated pipe (called drain tile) all the way along the trench. Gravel is not needed toward the exit of the tile where the trench becomes shallow.
Add 3″ to 4″ of gravel on top of the pipe and then fold the edges of the landscape fabric over the top of the gravel and pipe, essentially making an outer sheath of fabric.
Fill the trench with soil, and tamp down, leaving about 1″ for the sod. Scratch the top of the soil lightly with a garden rake.
Replace the sod you removed. Roll the sod to ensure firm contact with the soil and water well along the length of the trench. Cover the outlet of the tile with a PVC grate and/or large rocks
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